I'm picking it up in this deal so I've not played it yet, but the reviews are pretty decent, a lot better than the 3DS Mario Tennis game. There's a fairly big chunk of DLC courses and a few characters, which I think has an MK8 style discount for buying it all at once.

EDITED at 20:00 (UK): Smash Bros has sold out (but you can place a back order at the same price); the price for Toad Tracker has increased to £30; the console is still available at the £120 mark; and Rayman is still £15.

I learned the hard way to not go after those kinds of "I found this in a supermarket, might be national" deals; despite living near several large supermarkets, all of their games sections are an absolute joke. Great find if you can get one, just add on the cost of a large external HDD and it's still a decent deal.